/*
 * Copyright 2024 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.pajamas.daydream.template.sequence.context;

import org.pajamas.daydream.template.sequence.SequenceContext;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * @author william
 * @since 2024/4/6
 */
public class ArgumentContext implements SequenceContext {
    private final Object[] args;

    public ArgumentContext(Object... args) {
        this.args = args != null ? args : new Object[0];
    }

    @Nullable
    @Override
    public Object doGetValue(@Nonnull String key) {
        int idx = this.parseIdx(key);
        return idx < 0 ? null : this.args[idx];
    }

    private int parseIdx(String string) {
        try {
            int idx = Integer.parseInt(string);
            return idx >= 0 && idx < this.args.length ? idx : -1;
        } catch (NumberFormatException e) {
            return -1;
        }
    }
}
